It'd be great to have GetCurrentField function in Qlik Sense, unfortunately it's still not available.
Let me know what you think about this workaround using GetSelectedCount, which is supported in Qlik Sense. In my app I've created a drill-down group with the following time dimensions:
So, first of all, create a variable with the fields included in your drill-down group as follows:
vGetCurrentTimeFields = if(getselectedcount(Year)=0,'Year',
if(getselectedcount(Year)=1 and getselectedcount(Quarter)=0,'Quarter',
if(getselectedcount(Quarter)=1 and getselectedcount(MonthName)=0,'MonthYear',
if(getselectedcount(MonthName)=1 and getselectedcount(Date)=0,'Day',
I know what you might be thinking... field names are hardcoded. Yes, but with this simple logic you can retrieve the current field name within a drill down group!! Look at the following pictures. I created a bar chart in which the title is dynamic:
Hope this was helpful!